The one thing Calhoun may have for Drummond to digest is Hasheem Thebeet. Hash was the #2 pick. He left too early. He got his 5-6 million, but he never improved while in the NBA. As a result, when his 3 year contract is up, he'll most likely be cut. Hash will probably finish out in Europe.
The NBA wants Drummond on potential. But improving, on your potential, in the NBA, is tough. Especially when you are 18. I do believe Drummond stays another year.
Noel, if he goes to KY it'll be a year. Syracuse, UConn, or any other school he's considering will try to rationalize with him that it's better to stay 2 years. Hopefully the new NBA CBA will allow for 2 years. But, it doesn't seem like this is a NBA or Union priority.